Pakistani rangers display seized weapons after an operation in southern Pakistani port city of Karachi on Dec. 9, 2012. At least 40 suspects were arrested in the operation on Sunday, local media said. (Xinhua Photo/Masroor)

Pakistani rangers display seized weapons after an operation in southern Pakistani port city of Karachi on Dec. 9, 2012. At least 40 suspects were arrested in the operation on Sunday, local media said. (Xinhua Photo/Masroor)

Pakistani rangers take part in an operation in southern Pakistani port city of Karachi on Dec. 9, 2012. At least 40 suspects were arrested in the operation on Sunday, local media said. (Xinhua Photo/Masroor)